21239919

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{4787}}^1$

素因数の和:4839

約数の個数: 24

約数和(自身を含む): 33611760

約数和(自身を除く): 12371841

約数列:

[1, 3, 9, 17, 29, 51, 87, 153, 261, 493, 1479, 4437, 4787, 14361, 43083, 81379, 138823, 244137, 416469, 732411, 1249407, 2359991, 7079973, 21239919]

約数ペア:

[(1, 21239919), (3, 7079973), (9, 2359991), (17, 1249407), (29, 732411), (51, 416469), (87, 244137), (153, 138823), (261, 81379), (493, 43083), (1479, 14361), (4437, 4787)]